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If you are trying to build your own microcontroller system, then SDCC is suitable for you. You can adopt SDCC with no cost (license under GPL) and it supports under both Windows and Linux platform. SDCC able to compile C code for difference microcontroller, such as MCS-51, Z80, Motorola 68HC08 based MCUs and even Microchip’s MCU PIC and PIC18. You can get more information for SDCC from here. To install SDCC you can:

sudo apt-get install sdcc

or compile it from the source. The step to install SDCC from sources is showing here. So when you want to compile your C code, just enter:

sdcc filename.c

If you need to specified the cpu architecture, uses ‘-m’:

sdcc -mpic16 filename.c

The command line above will be used to compile code for PIC16. Here is the list of architectures that supported with ‘-m’ :

pic
pic16
mcs51
z80
ds390
ds400
avr
gbz80

By default SDCC will create Intel Hex files, if you need other format just specified with ‘–out-fmt-xxx’: